This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. Built for high-performance gear Blok Stax is a division of the Monitor Audio Group . They understand audiophile audio gear, and they've designed their Stax 2G modular rack system to eliminate performance-robbing vibrations. This unit goes atop a Blok Stax 2G Base (sold separately). The thick, rigid shelf rests on silicone isolation pads to isolate it from unwanted resonances. An indentation in the back provides space for cables when the unit's flush against the wall. Need more dampening? The side supports are hollow and can be filled with acoustically inert material like sand or shot for added mass and resonance control. What's in the Box: 1. Shelf 2. 2 Shelf supports 3. Four M10 bolts